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The Electric Field

The Electric Field. The electric field E at a point in space is defined as an electric force F , acting on a positive test charge q divided by the magnitude of the test charge. Units of Electric Field. 1 N/C. Superposition Principle for Electric Fields. Field Lines.

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The Electric Field

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  1. The Electric Field

  2. The electric field E at a point in space is defined as an electric force F, acting on a positive test charge q divided by the magnitude of the test charge

  3. Units of Electric Field 1 N/C

  4. Superposition Principlefor Electric Fields

  5. Field Lines

  6. At every point of electric field line, electric field E is tangent to this line. No two field lines can cross! • The line must begin at positive charge and terminate on the negative one unless go to infinity. • The number of line per unit area is proportional to the magnitude of electric field.

  7. Electric Fields and Conductors

  8. Important: electric field inside of good conductor is zero!!!!

  9. Important: any net charge on a good conductor distributes itself on the surface!!!!

  10. Electric field is always perpendicular to the surface of conductor:

  11. Conceptual Example A hollow metal box is placed between two parallel charged plates. What’s the field like inside the box?

  12. P d d q Q Is it possible to place a charge at point Q such that the electric field produced at point P by the two charges will be add to zero?

  13. Two positive charges are a fixed distance apart. The sum of their charges is QT. What charge must each have in order: • Maximize the electric force; • Minimize it.

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